Surgical buttress loading and attaching/detaching assemblies

ABSTRACT

A surgical stapling system includes a surgical stapling apparatus and a staple cartridge surgical buttress assembly. The surgical stapling apparatus includes a handle assembly, an elongate tubular body extending distally from the handle assembly, and an end effector extending distally from the elongate tubular body. The end effector includes an anvil assembly and a staple cartridge assembly. The staple cartridge surgical buttress assembly includes a surgical buttress and a leash. The surgical buttress includes a body having an annular configuration and legs extending from the body. The body is positioned against a tissue facing surface of the staple cartridge assembly and the legs are positioned against a housing of the staple cartridge assembly. The leash is threaded through at least one of the legs and extends proximally from the surgical buttress towards the handle assembly.

CROSS-REFERENCE TO RELATED APPLICATIONS

The present application claims the benefit of, and priority to, U.S. Provisional Patent Application Ser. No. 62/789,580, filed Jan. 8, 2019, U.S. Provisional Patent Application Ser. No. 62/725,327, filed Aug. 31, 2018, U.S. Provisional Patent Application Ser. No. 62/668,851, filed May 9, 2018, and U.S. Provisional Patent Application Ser. No. 62/668,858, filed May 9, 2018 the entire contents of each of which being hereby incorporated herein by reference.

TECHNICAL FIELD

The present application relates to surgical buttresses for use with surgical stapling apparatus and more particularly, to surgical buttress loading and attaching/detaching assemblies for releasably securing the surgical buttress to a surgical stapling apparatus.

BACKGROUND

Surgical stapling apparatus are employed by surgeons to sequentially or simultaneously apply one or more rows of fasteners, e.g., staples or two-part fasteners, to body tissue for the purpose of joining segments of body tissue together and/or creating anastomoses.

Linear surgical stapling apparatus generally include a pair of jaws or finger-like structures between which the body tissue to be joined is placed. When the surgical stapling apparatus is actuated, or “fired”, longitudinally moving firing bars contact staple drive members in one of the jaws. The staple drive members push the surgical staples through the body tissue and into an anvil in the opposite jaw which forms the staples. If body tissue is to be removed or separated, a knife blade can be provided in one of the jaws of the apparatus to cut the body tissue between the lines of staples.

Annular surgical stapling apparatus generally include a staple cartridge assembly including annular rows of staples, an anvil assembly operatively associated with the staple cartridge assembly, and an annular blade disposed internal to the annular rows of staples. In use, during an end-to-end circular anastomosis procedure, two ends of hollow tissue sections (e.g., bowels, intestines, or other tubular organs) are positioned between the anvil and staple cartridge assemblies and are joined by clamping the two ends together and driving the annular rows of staples through the clamped tissue sections. During firing of the staples, the annular blade is advanced to cut portions of the tissue sections extending inside the staple lines, thereby establishing a passage through the two stapled tissue sections.

Surgical supports, e.g., meshes or buttress materials, may be used in combination with surgical stapling apparatus to bridge, repair, and/or reinforce tissue defects within a patient such as those occurring, for example, in the abdominal wall, chest wall, diaphragm, or musculo-aponeurotic areas of the body. The buttress material reinforces the staple line as well as covers the juncture of the tissues to reduce leakage prior to healing. The buttress material can help promote proper staple formation while reducing twisting/malformation caused by any misalignment of tissue and/or unusual or non-uniform tissue. The buttress material can also provide support to weakened tissue, or help address differences in the thickness of tissues.

Accordingly, buttress materials provide clinical benefits. Nonetheless, improvements are desired, for example, to reduce the complexity of manufacture and/or application of the buttress materials onto surgical stapling apparatus or into tissue, or to expand the range of application for use of the buttress materials.

SUMMARY

In an aspect of the present disclosure, a surgical buttress loading assembly for use with a surgical stapling apparatus includes a surgical buttress and a surgical buttress applicator. The surgical buttress includes a tubular body and an elongate member extending from the tubular body. The surgical buttress applicator includes a base and a handle releasably engaged with the base. The elongate member is disposed within and extends through the handle, and the tubular body of the surgical buttress is positioned within a cavity of the base.

The base of the surgical buttress applicator may include an elongate body having a proximal end defining an opening into the cavity, and a closed distal end. In embodiments, a tab extends proximally from the proximal end of the elongate body of the base and between the handle and the cavity of the base, and is positioned through an aperture defined in the elongate member of the surgical buttress. In some embodiments, a tab extends proximally from the proximal end of the elongate body of the base, and is positioned through an aperture defined in the tubular body of the surgical buttress.

The base of the surgical buttress applicator may include a fin having a concave wall defining an arcuate cut-out configured to receive the handle therein. The handle of the surgical buttress applicator may include an outer wall defining a groove therein that is configured to receive the concave wall of the base therein to releasably retain the handle within the arcuate cut-out of the base.

The handle of the surgical buttress application may include an outer handle housing including an outer wall and an inner wall defining an annular cavity therebetween. The elongate member of the surgical buttress may be disposed within the annular cavity of the outer handle housing. In embodiments, the outer wall of the outer handle housing includes a slot defined therethrough that is in fluid communication with the annular cavity, and the elongate member of the surgical buttress extends through the slot.

In embodiments, the handle of the surgical buttress application includes an inner handle housing rotatably disposed within the annular cavity of the outer handle housing, and the elongate member of the surgical buttress is wrapped around the inner handle housing. In some embodiments, the inner wall of the outer handle housing includes flexible wall segments extending radially around a central opening defined in the outer handle housing. At least one of the flexible wall segments may include a lip extending therefrom to aid in retaining the inner handle housing within the annular cavity of the outer handle housing. In some embodiments, the inner handle housing includes an annular base including an inner surface configured to engage and be rotatably mounted on the inner wall of the outer handle housing. The inner handle housing may include annular flanges extending from opposed sides of the annular base to aid in retaining the elongate member of the surgical buttress on an outer surface of the annular base.

In another aspect of the present disclosure, a surgical stapling system includes a surgical stapling apparatus and a surgical buttress loading assembly. The surgical stapling apparatus includes a handle assembly, an elongate tubular body portion extending distally from the handle assembly, and an end effector extending distally from the elongate tubular body portion. The end effector includes an anvil assembly and a staple cartridge assembly. The surgical buttress loading assembly includes a surgical buttress and a surgical buttress applicator. The surgical buttress includes a tubular body and an elongate member extending from the tubular body. The surgical buttress applicator includes a base and a handle releasably engaged with the base. The elongate member is disposed within and extends through the handle, and the tubular body of the surgical buttress is positioned within a cavity of the base. The cavity of the base is sized and shaped to slidably receive at least one of the anvil assembly or the staple cartridge assembly of the surgical stapling apparatus therein.

In embodiments, the tubular body of the surgical buttress includes a buttress portion and a folded portion, and the base of the surgical buttress applicator includes a first wall portion configured to extend over a tissue facing surface of the anvil or the staple cartridge assembly and a second wall portion configured to extend around the anvil or the staple cartridge assembly and over an outwardly facing surface of the anvil or staple cartridge assembly. The buttress portion of the surgical buttress is positioned adjacent to the first wall portion and the folded portion is positioned adjacent to the second wall portion such that the tubular body of the surgical buttress is open to receive the anvil or staple cartridge assembly therein.

The handle of the surgical buttress applicator may include a pair of fingers extending from an outer wall thereof that are configured to releasably engage the elongate tubular body portion of the surgical stapling apparatus.

In yet another aspect of the present disclosure, a method of using a surgical buttress loading assembly with a surgical stapling apparatus includes: sliding a surgical buttress loading assembly onto an anvil assembly or a staple cartridge assembly of a surgical stapling apparatus to dispose the anvil or staple cartridge assembly within a tubular body of the surgical buttress, the surgical buttress loading assembly including: a surgical buttress including a tubular body and an elongate member extending from the tubular body; and a surgical buttress applicator including a base and a handle releasably engaged with the base, the elongate member disposed within and extending through the handle, and the tubular body of the surgical buttress positioned within a cavity of the base.

The method may further include detaching the handle of the surgical buttress applicator from the base; and sliding the base of the surgical buttress applicator off of the anvil or staple cartridge assembly, leaving the tubular body of the surgical buttress disposed over the anvil or staple cartridge assembly.

In embodiments, the method further includes attaching the handle of the surgical buttress applicator to the elongate tubular body portion of the surgical stapling apparatus. In some embodiments, the method further includes: firing the surgical stapling apparatus to drive fasteners through a buttress portion of the tubular body of the surgical buttress; and pulling the handle of the surgical buttress applicator away from the buttress portion to separate the elongate member and a folded portion of the tubular body of the surgical buttress from the buttress portion.

In an aspect of the present disclosure, a surgical stapling system includes a surgical stapling apparatus and a staple cartridge surgical buttress assembly. The surgical stapling apparatus includes a handle assembly, an elongate tubular body extending distally from the handle assembly, and an end effector extending distally from the elongate tubular body. The end effector includes an anvil assembly and a staple cartridge assembly. The staple cartridge surgical buttress assembly includes a surgical buttress and a leash. The surgical buttress includes a body having an annular configuration and legs extending from the body. The body is positioned against a tissue facing surface of the staple cartridge assembly and the legs are positioned against a housing of the staple cartridge assembly. The leash is threaded through at least one of the legs and extends proximally from the surgical buttress towards the handle assembly.

Each of the legs of the surgical buttress may include at least one opening or cutout defined therein. The legs of the surgical buttress may alternate between including at least one opening and at least one cutout defined therein. In embodiments, a central portion of the leash is looped through a pair of openings defined in a first leg of the legs of the surgical buttress, and first and second elongated portions of the leash are passed around the housing of the staple cartridge assembly and through an opening defined in a second leg of the legs of the surgical buttress that is opposed to the first leg. In some embodiments, third and fourth legs of the legs of the surgical buttress each include a pair of opposed cutouts defined therein, and the first and second elongated portions of the leash respectively extend under the pair of opposed cutouts.

Free ends of the legs of the surgical buttress may be secured to the housing of the staple cartridge assembly. A sleeve tube may be positioned around the housing of the staple cartridge assembly and over free ends of the legs of the surgical buttress to retain the legs against the staple cartridge assembly.

In embodiments, the surgical stapling system further includes an anvil surgical buttress assembly. The anvil surgical buttress assembly includes a surgical buttress and an anvil cap. The surgical buttress includes a body having an annular configuration and legs extending from the body. The body is positioned against a tissue facing surface of the anvil assembly and the legs are positioned against a distal surface of a housing of the anvil assembly. The anvil cap is coupled to the housing of the anvil assembly. The anvil cap is movable between an approximated position in which the legs of the surgical buttress are captured between the anvil cap and the housing of the anvil assembly and an unapproximated position in which the anvil cap is spaced from the housing and the legs of the surgical buttress are released.

In embodiments, the anvil cap includes a cap body supported on the distal surface of the housing and pegs extending proximally from the cap body. The pegs are positioned through openings defined in the housing. In some embodiments, the pegs of the anvil cap have flanged ends. In certain embodiments, each of the pegs of the anvil cap has a split body including first and second legs terminating at the flanged ends, the first and second legs deflectable inwardly and outwardly relative to each other.

In another aspect of the present disclosure, a staple cartridge assembly includes a housing, a staple guide, a surgical buttress, and a leash. The staple guide is supported within the housing and includes a tissue facing surface having staple receiving slots defined therein. Each of the staple receiving slots houses a staple therein. The surgical buttress includes a body having an annular configuration and legs extending from the body. The body is positioned against the tissue facing surface of the staple guide and the legs are positioned against the housing. The leash is threaded through at least one of the legs and extends proximally from the surgical buttress.

Each of the legs of the surgical buttress may include at least one opening or cutout defined therein. The legs of the surgical buttress may alternate between including at least one opening and at least one cutout defined therein. In embodiments, a central portion of the leash is looped through a pair of openings defined in a first leg of the legs of the surgical buttress, and first and second elongated portions of the leash are passed around the housing and through an opening defined in a second leg of the legs of the surgical buttress that is opposed to the first leg. In some embodiments, third and fourth legs of the legs of the surgical buttress each include a pair of opposed cutouts defined therein, and the first and second elongated portions of the leash respectively extend under the pair of opposed cutouts.

Free ends of the legs of the surgical buttress may be secured to the housing. A sleeve tube may be positioned around the housing and over free ends of the legs of the surgical buttress to retain the legs against the housing.

BRIEF DESCRIPTION OF THE DRAWINGS

The above and other aspects, features, and advantages of the present disclosure will be apparent in light of the following detailed description when taken in conjunction with the accompanying drawings, which are incorporated in and constitute a part of this specification, wherein:

FIG. 1 is a perspective view of a surgical stapling apparatus having a surgical buttress disposed thereon in accordance with an embodiment of the present disclosure;

FIG. 2 is an exploded, perspective view of anvil and staple cartridge assemblies of an end effector of the surgical stapling apparatus of FIG. 1;

FIG. 3 is a perspective view of an end effector of the surgical stapling apparatus of FIG. 1, showing the surgical buttress disposed thereon;

FIG. 4 is a side view of the surgical buttress of FIG. 1, separated from the surgical stapling apparatus;

FIG. 5 is a plan view of the surgical buttress of FIG. 4, in an unfolded condition in accordance with an embodiment of the present disclosure;

FIG. 6 is a side, perspective view of a surgical buttress loading assembly including a surgical buttress applicator and a surgical buttress in a loaded configuration in accordance with an embodiment of the present disclosure;

FIG. 7 is an end, perspective view of a base of the surgical buttress applicator of FIG. 6;

FIG. 8 is a perspective view, with parts separated, of the surgical buttress loading assembly of FIG. 6;

FIG. 9 is a side view of the surgical stapling apparatus of FIG. 1 including the surgical buttress loading assembly of FIG. 6 disposed thereon;

FIG. 10 is a side view of a surgical stapling apparatus including the surgical buttress loading assembly of FIG. 9, illustrating a handle of the surgical buttress applicator separated from a base of the surgical buttress applicator;

FIG. 11 is a perspective view of anvil and cartridge buttresses in accordance with another embodiment of the present disclosure;

FIG. 12 is a cross-sectional view of the anvil buttress of FIG. 11;

FIG. 13 is a perspective view of an end effector having the anvil and cartridge buttresses of FIG. 11 disposed thereon in accordance with an embodiment of the present disclosure

FIG. 14 is a perspective view of a surgical stapling apparatus having surgical buttresses disposed thereon in accordance with an embodiment of the present disclosure;

FIG. 15 is an exploded, perspective view of an anvil assembly of an end effector of the surgical stapling apparatus of FIG. 14;

FIG. 16 is a cross-sectional, close-up view of an anvil head of the anvil assembly of FIG. 15, illustrating an anvil cap in an approximated position securing a surgical buttress to the anvil head;

FIG. 17 is a cross-sectional, close-up view of the anvil head of FIG. 16, illustrating the anvil cap in an unapproximated position releasing the surgical buttress from the anvil head;

FIG. 18 is an exploded, perspective view of a staple cartridge assembly of an end effector of the surgical stapling apparatus of FIG. 14;

FIG. 19 is a plan view of a surgical buttress of the surgical stapling apparatus of FIG. 14 in accordance with an embodiment of the present disclosure;

FIG. 20 is a perspective view of a staple cartridge assembly of the surgical stapling apparatus of FIG. 14 including the surgical buttress of FIG. 19 and a leash, illustrating a step-by-step release of the surgical buttress from the staple cartridge assembly in accordance with an embodiment of the present disclosure;

FIG. 21 is a perspective view of a surgical stapling apparatus in accordance with another embodiment of the present disclosure; and

FIG. 22 is a perspective view of a surgical stapling apparatus in accordance with yet another embodiment of the present disclosure.

DETAILED DESCRIPTION OF EMBODIMENTS

Embodiments of the present disclosure will now be described in detail with reference to the drawing figures wherein like reference numerals identify similar or identical elements. Throughout this description, the term “proximal” refers to a portion of a structure, or component thereof, that is closer to a user, and the term “distal” refers to a portion of the structure, or component thereof, that is farther from the user. Directional reference terms, such as “top,” “bottom,” “side,” and the like, are used to ease description of the embodiments and are not intended to have any limiting effect on the ultimate orientation of a structure or any part thereof. In the following description, well-known functions or constructions are not described in detail to avoid obscuring the present disclosure in unnecessary detail.

Referring now to FIG. 1, an exemplary surgical stapling apparatus or surgical stapler 1 in the form of a linear surgical stapling device is shown for use in stapling tissue and applying one or more buttress materials or surgical buttresses to the tissue. The surgical stapling apparatus 1 generally includes a handle assembly 10, an elongate tubular body portion 20 extending distally from the handle assembly 10, and an end effector or jaw assembly 30 extending distally from the elongate tubular body portion 20. The jaw assembly 30 includes an anvil assembly 40 and a staple cartridge assembly 50. The jaw assembly 30 may be permanently affixed to the elongate tubular body portion 20 or may be detachable with respect to the elongate tubular body portion 20 and thus, replaceable with a new jaw assembly 30. The anvil assembly 40 and/or the staple cartridge assembly 50 is pivotable with respect to the elongate tubular body portion 20 such that the anvil and/or staple cartridge assemblies 40, 50 is movable between an open position in which the anvil and staple cartridge assemblies 40, 50 are spaced apart with respect to each other and a closed position in which the anvil and staple cartridge assemblies 40, 50 are substantially adjacent each other.

The handle assembly 10 includes a stationary handle member 12 a, a movable handle member 12 b, and a barrel portion 14. An articulation lever 16 is mounted on the forward end of the barrel portion 14 to facilitate articulation of the jaw assembly 30. A rotatable member 18 is also mounted on the forward end of the barrel portion 14, adjacent the articulation lever 16. Rotation of the rotatable member 18 relative to the barrel portion 14 rotates the elongate tubular body portion 20 and the jaw assembly 30 relative to the handle assembly 10 so as to properly orient the anvil and staple cartridge assemblies 40, 50 relative to tissue to be stapled. A knob 19 is movably positionable along the barrel portion 14. The knob 19 is advanced distally to approximate or close the anvil and staple cartridge assemblies 40, 50, relative to each other, and retracted proximally to unapproximate or open the anvil and staple cartridge assemblies 40, 50, with respect to each other. Actuation of the movable handle member 12 b applies lines of staples 58 (FIG. 2) to tissue captured between the anvil and staple cartridge assemblies 40, 50.

As shown in FIG. 2, the anvil assembly 40 includes an anvil plate 42 having a central longitudinal slot 41 formed therein, and a cover plate 44 secured over the anvil plate 42 such that the cover plate 44 defines a top or outwardly facing surface 46 of the anvil assembly 40. The anvil plate 42 may include a plurality of staple forming pockets/cavities (not shown) defined in an inwardly or tissue facing surface 48 thereof.

The staple cartridge assembly 50 includes a cartridge carrier 52 defining an elongated support channel 51 configured and dimensioned to selectively receive a staple cartridge 54 therein. The cartridge carrier 52 also defines a bottom or outwardly facing surface 53 of the staple cartridge assembly 50. The staple cartridge 54 is removable and replaceable in the cartridge carrier 52 of the staple cartridge assembly 50. The staple cartridge 54 includes an inwardly or tissue facing surface 56 defining staple pockets or retention slots 55 formed therein for receiving a plurality of fasteners or staples 58 and staple pushers 60. A central longitudinal slot 57 is formed in and extends along a substantial length of the staple cartridge 54 to facilitate passage of a knife blade 62 of a drive bar 64 therethrough. During operation of the surgical stapler 1, an actuation sled 66 translates through the staple cartridge 54 to advance cam wedges 68 of the actuation sled 66 into sequential contact with the staple pushers 60, to cause the staple pushers 60 to translate vertically within the staple pockets 55 and urge the staples 58 from the staple pockets 55 towards the tissue facing surface 48 of the anvil plate 42 of the anvil assembly 40.

For a detailed description of the structure and function of exemplary surgical stapling apparatus, reference may be made to U.S. Pat. Nos. 8,256,656, 7,819,896, and 7,128,253, the entire content of each of which is incorporated herein by reference. It should be appreciated that principles of the present disclosure are equally applicable to surgical stapling apparatus having other configurations such as, for example, the types described in U.S. Pat. Nos. 7,334,717, 5,964,394, and 5,915,616, the entire content of each of which is incorporated herein by reference. Accordingly, it should be understood that a variety of surgical stapling apparatus may be utilized with the surgical buttresses and/or surgical buttress applicators of the present disclosure such as, for example, laparoscopic staplers, open staplers, transverse anastomosis staplers, and end-to-end anastomosis staplers having a circular staple cartridge and anvil, as well as staple cartridge assemblies housing surgical fasteners other than staples.

With reference again to FIG. 1, a surgical buttress 100 is shown releasably coupled to the anvil assembly 40 of the surgical stapler 1. The surgical buttress 100 is fabricated from biocompatible materials which are bioabsorbable or non-absorbable, natural or synthetic materials. It should be understood that any combination of natural, synthetic, bioabsorbable, and/or non-bioabsorbable materials may be used to form the surgical buttress 100. The surgical buttress 100 may be biodegradable (e.g., formed from bioabsorbable and bioresorable materials) such that the surgical buttress 100 decomposes or is broken down (physically or chemically) under physiological conditions in the body, and the degradation products are excretable or absorbable by the body. Components or portions of the surgical buttress 100 may be formed from the same material or different materials.

In embodiments, at least a portion of the surgical buttress 100 is made from biodegradable materials selected from the following group: natural collagenous materials, cat gut, and synthetic resins including those derived from alkylene carbonates, trimethylene carbonate, tetramethylene carbonate, caprolactone, valerolactone, dioxanone, polyanhydrides, polyesters, polyacrylates, polymethylmethacrylates, polyurethanes, glycolic acid, lactic acid, glycolide, lactide, polyhydroxy butyrates, polyorthoester, polyhydroxy alkanoates, homopolymers thereof, and copolymers thereof. In embodiments, at least a portion of the surgical buttress 100 is made from non-biodegradable materials selected from the following group: polyolefins, polyethylene, polydimethylsiloxane, polypropylene, copolymers of polyethylene and polypropylene, blends of polyethylene and polypropylene, ultra high molecular weight polyethylene, polyamides, polyesters, polyethylene terephthalate, polytetrafluoroethylene, polyether-esters, polybutester, polytetramethylene ether glycol, 1,4-butanediol, and polyurethanes.

The surgical buttress 100 may be porous, non-porous, or combinations thereof. Suitable porous structures include, for example, fibrous structures (e.g., knitted structures, woven structures, and non-woven structures) and/or foams (e.g., open or closed cell foams). Suitable non-porous structures include, for example, films. The surgical buttress 100, or portions thereof, may be a non-woven structure formed by melt-blown or melt-spun methods, a mesh material, a braid material, and/or a molded or extruded sheet. The surgical buttress 100, or portions thereof, may be a single porous or non-porous layer, or include a plurality of layers including any combination of porous and/or non-porous layers.

As shown in FIGS. 3 and 4, the surgical buttress 100 includes an elongate member 102, a folded portion 104, and a buttress portion 106. The elongate member 102 is coupled to the folded portion 104, and the folded portion 104 is coupled to the buttress portion 106 and is separable therefrom by perforations 108. Together, the folded portion 104 and the buttress portion 106 form a tubular body 110 that is sized and shaped to facilitate the reception of the anvil assembly 40 and/or the staple cartridge assembly 50 therethrough.

The elongate member 102 is secured to the folded portion 104 of the surgical buttress 100 and extends proximally therefrom. The elongate member 102 is of a sufficient length to be accessible outside of a patient's body and may extend the length of the elongate tubular body portion 20 of the surgical stapler 1. The elongate member 102 may be a band, a cord, a rope, a strap, a suture, among other elongate structures tethered to or integrally formed with the folded portion 104 of the surgical buttress 100. In some embodiments, the elongate member 102 may include two or more elongate sections such as, for example, a suture attached to a strip of material that extends proximally from the folded portion 104 of the surgical buttress 100.

When the elongate member 102 is pulled away from the tubular body 110 (e.g., proximally towards a user), the folded portion 104 and the elongate member 102 separate from the buttress portion 106 along the perforations 108. It should be understood, however, that the perforations 108 may be omitted from the surgical buttress 100. For example, the juncture between the folded portion 104 and the buttress portion 106 may be formed or otherwise secured to one another to facilitate separation of the folded portion 104 from the buttress portion 106 upon application of a force to the elongate member 102.

The folded portion 104 can include one or more sections of material, and can be made from the same material as the buttress portion 106, or from a different material, as discussed above. The folded portion 104 can be secured to itself to form the tubular body 110 and/or the buttress portion 106 can be attached to the folded portion 104 or itself. The folded portion 104 and/or the buttress portion 106, or sections thereof, may be integrally formed or secured together via any suitable attachment features within the purview of those skilled in the art, such as, mechanical attachment features (e.g., sutures, pins), chemical attachment features (e.g., adhesives), and/or attachment methods (e.g., welding).

The folded portion 104 can include first and second sections 112, 114 secured to one another. In embodiments, the first and second sections 112, 114 are welded to each other. The elongate member 102 can be unitary with the folded portion 104 and/or may be permanently secured to the folded portion 104. As seen in FIG. 4, the elongate member 102 can be integrally formed with the first section 112 of the folded portion 104 and attached to the second section 114 by welding at an attachment region 113. The elongate member 102 can include one or more elongate sections, as discussed above, and can be made from the same material, or different material, as the folded and/or buttress portions 104, 106.

With continued reference to FIG. 3, the surgical buttress 100 is disposed on the anvil assembly 40 of the stapler 1 with the buttress portion 106 positioned over the tissue facing surface 48 of the anvil assembly 40, the folded portion 104 positioned over the outwardly facing surface 46 of the anvil assembly 40, and the elongate member 102 extending proximally along the elongate tubular body portion 20 of the surgical stapler 1. The perforations 108 are positioned adjacent side surfaces 49 of the anvil assembly 40 that interconnect the outwardly and tissue facing surfaces 46, 48 of the anvil assembly 40.

The perforations 108 can be any size and shape, such as small pin-holes or larger openings such as, for example, the elongated openings shown in FIG. 3, or the perforations 108 can be a single feature, such as a line of weakness in the buttress material or materials forming the folded and buttress portions 104, 106. The perforations 108 may be formed using laser cutting, knife cutting, press cutting, scoring, etching, among other methods within the purview of those skilled in the art. In some embodiments, the surgical buttress 100 is formed from a non-woven polyglycolide material that is laser cut to form the perforations 108.

As shown in FIG. 5, the entire surgical buttress 100 may be formed from a single sheet of material 120. The surgical buttress 100 is cut from the single sheet of material 120 and the perforations 108 are formed therein. The single sheet of material 120 is cut such that the surgical buttress 100 includes the elongate member 102, the folded portion 104 including first and second sections 112, 114, and the buttress portion 106. The first and second sections 112, 114 of the folded portion 104 can be folded and attached to one another before the surgical buttress 100 is disposed on or around the anvil assembly 40 of the surgical stapler 1 (e.g., prior to loading the surgical buttress 100 into a surgical buttress applicator 200 (FIG. 6)), or as the surgical buttress 100 is applied to the anvil assembly 40. As discussed above, the first and second sections 112, 114 of the folded portion 104 can be attached to one other by, for example, welding, using adhesives, tying sutures, etc.

Turning now to FIG. 6, a surgical buttress loading assembly 201 is shown. The surgical buttress loading assembly 201 includes a surgical buttress applicator 200 configured for positioning the surgical buttress 100 onto a surgical stapler 1 (FIG. 1) and/or removing the elongate member 102 and the folded portion 104 (FIG. 1) of the surgical buttress 100 from a surgical site. The surgical buttress applicator 200 includes a base 210 sized and shaped to releasably retain the tubular body 110 (FIG. 3) of the surgical buttress 100 therein, and a handle 220 configured to retain the elongate member 102 of the surgical buttress 100 therein.

As shown in FIGS. 7 and 8, the base 210 includes an elongate body 212 having a proximal end 212 a and a distal end 212 b, and defines a cavity 213 therein. The cavity 213 is sized and shaped to slidably receive at least one of the anvil or staple cartridge assembly 40, 50 (FIG. 1) of the surgical stapler 1 therein. The elongate body 212 includes a first or substantially flat wall section 214 a corresponding to the tissue facing surface 48, 56 (FIG. 2) of the anvil or staple cartridge assembly 40, 50 of the surgical stapler 1, and a second or rounded wall section 214 b configured to extend around the anvil or staple cartridge assembly 40, 50 and over the outwardly facing surface 46, 53 (FIG. 2) of the anvil or staple cartridge assembly 40, 50.

The proximal end 212 a of the elongate body 212 defines an opening into the cavity 213 of the base 210, and the distal end 212 b is closed by a distal wall section 214 c. It is envisioned, however, that the distal end 212 b of the elongate body 212 may be open. The proximal end 212 a further includes first and second tabs 216 a, 216 b extending proximally and axially from the respective first and second wall sections 214 a, 214 b of the elongate body 212 in opposed relation relative to each other. The first and second tabs 216 a, 216 b are configured to engage the surgical buttress 100.

The base 210 of the surgical buttress applicator 200 further includes a fin 218. The fin 218 extends from the second wall section 214 b of the elongate body 212. The fin 218 includes a concave wall 218 a defining an arcuate cut-out 219 configured to receive the handle 220 therein.

With reference now to FIGS. 6 and 8, the handle 220 includes an outer handle housing 230 and an inner handle housing 240 rotatably disposed within the outer handle housing 230. The elongate member 102 of the surgical buttress 100 is spooled, wound or rolled around the inner handle housing 240 and extends through a slot 237 defined through the outer handle housing 230 such that the tubular body 110 of the surgical buttress 100 is positionable within the cavity 213 of the base 210.

The outer handle housing 230 includes an outer wall 232 and an inner wall 234 defining an annular cavity 233 therebetween. The outer wall 232 includes a groove 235 defined therein that corresponds with, and is configured to frictionally engage, the concave wall 218 a of the fin 218 of the base 210 to releasably retain the handle 220 within the arcuate cut-out 219 of the base 210. The outer handle housing 230 further includes a pair of fingers 236 extending from the outer wall 232 that are configured to releasably engage the elongate tubular body portion 20 (FIG. 1) of the surgical stapler 1, and a slot 237 defined through the outer wall 232 that is sized and shaped for passage of the elongate member 102 of the surgical buttress 100 therethrough.

The inner wall 234 of the outer handle housing 230 includes flexible wall segments 238 extending radially around a central opening 239 defined in the outer handle housing 230. The flexible wall segments 238 are movable to allow a user to insert or remove the inner handle housing 240 into or out of the annular cavity 233 of the outer housing 230. At least one of the flexible wall segments 238 includes a lip 238 a extending towards the outer wall 232 to help retain the inner handle housing 240 within the annular cavity 233. In embodiments, at least two flexible wall segments 238 (e.g., opposed flexible wall segments 238) may each include a lip 238 a extending therefrom and, in some embodiments, alternating flexible wall segments 238 may each include a lip 238 a extending therefrom.

The inner handle housing 240 is concentric with and configured to be received within the annular cavity 233 of the outer handle housing 230. The inner handle housing 240 includes an annular base 242 having an inner surface 242 a configured to engage the inner wall 234 of the outer handle housing 230 and to be rotatably mounted thereon. The arcuate base 242 also includes an outer surface 242 b that is configured to receive the elongate member 102 of the surgical buttress 100 therearound. Annular flanges 244 a, 244 b extend from opposed sides of the annular base 242 adjacent respective sides of the elongate member 102 when the elongate member 102 is wrapped around the annular base 242.

In a method of assembling the handle 220, the elongate member 102 of the surgical buttress 100 is wrapped around the outer surface 242 b of the annular base 242 of the inner handle housing 240 such that the elongate member 102 conforms to the contour of the annular base 242. The elongate member 102 is wound around the annular base 242 such that a majority of the elongate member 102 is wound around the inner handle housing 240, and the tubular body 110 of the surgical buttress 100 freely extends therefrom. In embodiments, a terminal end of the elongate member 102 may be secured to the inner handle housing 240 and/or to itself (e.g., the terminal end may form a closed loop 107 a (FIG. 13) around the inner handle housing) to secure the elongate member 102 to the inner handle housing 240. The tubular body 110 is passed through the slot 237 of the outer handle housing 230 and pulled therethrough, and the inner handle housing 240 is inserted into the annular cavity 233 of the outer handle housing 230.

In a method of assembling the surgical buttress loading assembly 201, the assembled handle 220 is positioned within the arcuate cut-out 219 of the base 210 of the surgical buttress applicator 200, and the tubular body 110 of the surgical buttress 100, which includes the folded and buttress portions 104, 106 of the surgical buttress 100, is positioned within the cavity 213 of the base 210 of the surgical buttress applicator 200. The folded portion 104 of the surgical buttress 100 is positioned adjacent to the second wall section 214 b of the base 210 and the buttress portion 106 is disposed adjacent to the first wall section 214 a of the base 210 such that the tubular body 110 is open to receive the anvil or staple cartridge assembly 40, 50 therein.

The inner handle member 240 may then be rotated relative to the outer handle member 230 to wind or unwind the elongate member 102 around the inner handle member 240 so that the elongate member 102 is made taut as shown in FIG. 6. In the loaded configuration shown in FIG. 6, the portion of the elongate member 102 extending between the base 210 and the handle 220 of the surgical buttress applicator 200 is secured to the second tab 216 b of the base 210 to help retain the tubular body 110 of the surgical buttress 100 within the base 210. The second tab 216 b is positioned through an aperture 103 defined through the elongate member 102. The aperture 103 may be formed during assembly of the surgical buttress 100 into the surgical buttress applicator 200, or the aperture 103 may be pre-formed in the surgical buttress 100 prior to assembly. In some embodiments, the first tab 216 a of the base 210 of the surgical buttress applicator 200 may be engaged with an aperture 105 (FIG. 13) defined in the buttress portion 106 of the surgical buttress 100 to further help retain the tubular body 110 within the base 210 in an open configuration for receiving the anvil or staple cartridge assembly 40, 50 therein.

In a method of loading the surgical buttress 100 onto the surgical stapler 1, as shown in FIG. 9, the surgical buttress loading assembly 201 is applied to the anvil assembly 40 of the surgical stapler 1. A user grasps the handle 220 of the surgical buttress applicator 200 and manipulates the surgical buttress loading assembly 201 onto the anvil assembly 40 by aligning the cavity 213 (FIG. 7) of the base 210 with the distal end of the anvil assembly 40 and sliding the surgical buttress applicator 200 proximally over the anvil assembly 40 until the anvil assembly 40 abuts the distal wall section 214 c (FIG. 7) of the base 210. As discussed above, the shape (e.g., a transverse cross-sectional shape/profile) of the cavity 213 of the base 210 corresponds to the shape (e.g., a transverse cross-sectional shape/profile) of the anvil assembly 40 (or the staple cartridge assembly 50) for ease of application of the surgical buttress 100 thereon.

With the surgical buttress loading assembly 201 applied onto the anvil assembly 40 such that the anvil assembly 40 is received within the tubular body 110 of the surgical buttress 100 as well as within the base 210 of the surgical buttress applicator 200, the handle 220 of the surgical buttress applicator 200 is detached from the base 210 and pulled proximally towards the user, thereby unrolling the elongate member 102 from within the handle 220 of the surgical buttress applicator 200, as shown in FIG. 10. The handle 220 is secured to the elongate tubular body portion 20 of the surgical stapler 1 via the pair of fingers 236 of the outer handle housing 230 at a position proximal of the end effector 30, such as adjacent to the handle assembly 10 (FIG. 1) of the surgical stapler 1, and/or at least at a location outside of a patient's body during a surgical procedure. The user can then grasp the base 210 of the surgical buttress applicator 200 and slide it distally off of the anvil assembly 40. The base 210 may be removed from the anvil assembly 40 either prior to, or after, attaching the handle 220 to the surgical stapler 1. As the base 210 is slid distally, the surgical buttress 100 disengages from the second tab 216 b of the base 210 such that the surgical buttress 100 is left loaded on the anvil assembly 40. The surgical stapler 1 is now ready for use.

In a method of use, the loaded surgical stapler 1 is introduced to a surgical site through a trocar or other access device. The surgical stapler 1 is operated within methods known by those skilled in the art. Once the anvil and staple cartridge assemblies 40, 50 are clamped onto tissue, the surgical stapler 1 is fired. In firing the surgical stapler 1, the drive bar 64 (FIG. 2) is advanced distally through the jaw assembly 30 urging the staple pushers 60 upwardly which, in turn, drive the staples 58 out of the staple pockets 55 and through the buttress portion 106 of the surgical buttress 100 as well as the captured tissue, thereby stapling the buttress portion 106 to the tissue. During firing, the knife blade 62 of the drive bar 64 travels distally while substantially simultaneously cutting and dividing the tissue as well as the buttress portion 106 of the surgical buttress 100 disposed between the rows of now formed staples 58.

The folded portion 104 and the elongate member 102 of the surgical buttress 100 can then be detached from the now-stapled buttress portion 106 by pulling the handle 220 proximally to tear the folded portion 104 from the buttress portion 106 via the perforations 108. The handle 220 may be pulled separately from the surgical stapler 1 by detaching the handle 220 from the elongate tubular body portion 20 of the surgical stapler 1, or the handle 220 may be pulled when the surgical stapler 1 is pulled proximally away from the surgical site. Alternatively, the user may grasp an exposed portion of the elongate member 102 and pull the elongate member 102 directly.

It should be understood that additionally or alternatively, a surgical buttress loading assembly may be applied to the staple cartridge assembly of the surgical stapler and/or either the anvil assembly or the staple cartridge assembly can include a buttress material pre-loaded thereon. For example, in surgical stapling apparatus having staple cartridge assemblies that are removable and replaceable, the staple cartridge assembly may have a buttress pre-loaded onto it by the manufacturer. In these circumstances, the user can utilize a surgical buttress loading assembly that is ready for installation on the anvil assembly, as discussed above. In embodiments, the surgical stapling apparatus can be re-used on the same patient by reloading it with a staple cartridge assembly having a fresh set of staples ready to be fired and a fresh buttress material. A new surgical buttress loading assembly may be applied to the anvil assembly, as discussed above, or a fresh surgical buttress may be installed into the surgical buttress applicator, as also discussed above.

Further, the surgical buttress loading assembly can be sized and shaped to correspond to a particular jaw onto which it is to be assembled. For example, a first surgical buttress loading assembly may have a shape corresponding to the shape of the anvil assembly and a second surgical buttress loading assembly may have a shape corresponding to the staple cartridge assembly. As shown in FIG. 1, the anvil assembly 40 has a lower profile and is more curved in shape than the staple cartridge assembly 50, which is deeper and may be rounded or more rectangular in shape. Accordingly, the surgical buttress and the surgical buttress applicator of the present disclosure may be any size and/or shape to accommodate a variety of surgical stapler sizes and/or configurations.

As shown, for example, in FIGS. 11-13, surgical buttresses, shown as anvil and cartridge buttresses 100 a, 100 b, are respectively configured for use with the anvil and staple cartridge assemblies 40, 50 of the end effector 30 of the surgical stapler 1 (FIG. 1) and likewise, surgical buttress applicators (not shown) are configured for use with the anvil and cartridge buttresses 100 a, 100 b. The anvil and cartridge buttresses 100 a, 100 b each include an elongate member 102 a, 102 b, a folded portion 104 a, 104 b, and a buttress portion 106 a, 106 b. Perforations 108 a, 108 b are disposed between the folded portion 104 a, 104 b and the buttress portion 106 a, 106 b of the respective anvil and cartridge buttress 100 a, 100 b, and are optimized to allow for sequential detachment of the folded portion 104 a, 104 b from the buttress portion 106 a, 106 b when the elongate member 102 a, 102 b is pulled. The folded portion 106 a, 106 b and the buttress portion 106 a, 106 b are formed from a single sheet of material having the perforations 108 a, 108 b formed therein, and the elongate member 102 a, 102 b is attached to the respective folded portion 106 a, 106 b. Loops 107 a, 107 b are disposed at terminal ends of the respective elongate member 102 a, 102 b and are configured for positioning around the inner handle housing of the respective surgical buttress applicator with which the anvil and cartridge buttresses 100 a, 100 b are utilized.

The surgical buttress may be provided and/or sold as part of the surgical buttress loading assembly that includes the surgical buttress and the surgical buttress applicator. Alternatively, the surgical buttress and the surgical buttress applicator may be provided and/or sold separately and assembled by the user. In embodiments, one or more surgical buttresses and one or more surgical buttress applicators are provided in a kit. In some embodiments, the kit further includes one or more end effectors and, in certain embodiments, the kit further includes a surgical stapler.

With reference now to FIG. 14, a surgical stapling apparatus or surgical stapler 2 in the form of an annular surgical stapling device is shown for use in stapling tissue and applying one or more buttress materials or surgical buttresses to tissue. The surgical stapler 2 generally includes a handle assembly 310, an elongate tubular body 320 extending distally from the handle assembly 310, and an end effector 330 extending distally from the elongate tubular body 320. The end effector 330 includes an anvil assembly 332 and a staple cartridge assembly 334. The anvil assembly 332 is releasably coupled to a distal end portion 322 of the elongate tubular body 320, and the staple cartridge assembly 334 is disposed at the distal end portion 322 of the elongate tubular body 320.

The handle assembly 310 includes at least one movable handle member 312 for actuating the firing of staples 410 (FIG. 18) from the staple cartridge assembly 334 and the cutting of tissue secured between the anvil and staple cartridge assemblies 332, 334. The handle assembly 310 further includes an advancing member 314 for moving the anvil assembly 332 between an open or spaced apart position and a closed or approximated position relative to the staple cartridge assembly 334.

The elongate tubular body 320 may be flexible or rigid, and/or straight or curved along a portion or the entirety thereof. It should be understood that the elongate tubular body 320 may be otherwise configured (e.g., shaped and/or dimensioned) depending on, for example, the surgical application or procedure of use as is within the purview of those skilled in the art. The staple cartridge assembly 334 may be fixedly connected to the distal end portion 322 of the elongate tubular body 320 or may be configured to concentrically fit within, or be otherwise connected to, the distal end portion 322 of the elongate tubular body 320 such that the staple cartridge assembly 334 is removable and replaceable.

For a detailed description of the structure and function of exemplary surgical stapling apparatus, reference may be made to U.S. Pat. Nos. 4,473,077; 4,576,167; 5,005,749; 5,119,983; 5,588,579; 5,915,616; and 6,053,390, the entire contents of each of which are incorporated herein by reference. It should be understood that a variety of annular surgical stapling apparatus may be utilized with the surgical buttress assemblies of the present disclosure.

As shown in FIGS. 14 and 15, the anvil assembly 332 includes a head assembly 350 and a center rod assembly 360 pivotally secured to the head assembly 350. The head assembly 350 includes a central post or connector 351, a housing or anvil head 352, a backup plate 353, a cut ring assembly 354, an anvil plate 356, and a spacer 358. The connector 351 extends proximally from the housing 352 and is dimensioned to operatively couple to a first end portion 362 a of a center rod 362 of the center rod assembly 360. The connector 351 may be substantially centrally positioned through a bore (not shown) defined in the housing 352, or the connector 351 may be integrally or monolithically formed with the housing 352. One or more openings 352 a (e.g., pressure relief openings) are defined through the housing 352, and the housing 352 includes an inner annular recess 352 b and an outer annular recess 352 c supporting the backup plate 353, the cut ring assembly 354, the anvil plate 356, and the spacer 358 therein.

The anvil plate 356 is supported in the outer annular recess 352 c of the housing 352 and includes a tissue facing surface 357 having a plurality of staple forming pockets 357 a for receiving and deforming staples. The anvil plate 356 may include at least one tab 356 a extending radially outwardly form the anvil plate 356 that is received within a cutout 352 d formed in an outer rim of the housing 352. The tab 356 a and the cutout 352 d function to align and/or properly locate and retain the anvil plate 356 within the outer annular recess 352 c of the housing 352.

The inner annular recess 352 b is located between the connector 351 and the outer annular recess 352 c. The backup plate 353 includes a substantially centrally located opening 353 a positioned and slidably mounted about the connector 351 within the inner annular recess 352 b. The backup plate 353 includes a raised center platform 353 b and a pair of inwardly extending fingers 353 c, although other configurations are envisioned.

The cut ring assembly 354 includes a body 354 a and a cover 354 b. The body 354 a includes an opening 355 a having an inner configuration substantially the same as the platform 353 b of the backup plate 353 to facilitate positioning of the cut ring assembly 354 about the platform 353 b. The cover 354 b includes a substantially centrally located opening 355 b for receiving the connector 351 and is secured to an outwardly facing or proximal surface of the body 354 a. The cut ring assembly 354 may be fixedly secured or otherwise fastened to the backup plate 353.

The spacer 358 is positioned in the inner annular recess 352 b of the housing 352 between the backup plate 353 and an inner or proximally facing surface 352 e of the housing 352. The spacer 358 is annular and may include deformable tabs 358 a which engage a distally facing surface of the backup plate 353. The spacer 358 prevents the backup plate 353 and the cut ring assembly 354 from moving or being pushed into the inner annular recess 352 b of the housing 352 until a predetermined force sufficient to deform the tabs 358 a has been applied to the backup plate 353 and the cut ring assembly 354. The predetermined force may be, for example, close to but less than the force applied by an annular knife 420 (FIG. 18) of the staple cartridge assembly 334 to the cut ring assembly 354 as the surgical stapler 2 is fired. When the predetermined force is reached, e.g., during cutting of tissue, the backup plate 353 and the cut ring assembly 354 will move into the inner annular recess 352 b of the housing 252 and compress the spacer 358. It is envisioned that other crushable, deformable, collapsible, and/or movable spacing members may be used to retain the backup plate 353 and the cut ring assembly 354 in a fixed position until the predetermined force has been applied to the backup plate 353 and the cut ring assembly 354.

In embodiments, the backup plate 353 may be omitted and the cut ring assembly 354 may be configured for positioning about the connector 351 within the housing 352 with the spacer 358 positioned in the inner annular recess 352 b of the housing 352 between the cutting ring assembly 354 and the inner surface 352 e of the housing 352.

The center rod assembly 360 includes a center rod or anvil shaft 362, a plunger 364, and a plunger spring 365. A pivot pin 366 pivotably secures the connector 351 of the head assembly 350 to the center rod 362 via throughbores 367 such that the head assembly 350 is pivotably mounted to the center rod assembly 360.

The plunger 364 is slidably positioned in a bore 363 a formed in a first end portion 362 a of the center rod 362. The plunger 364 includes an engagement finger 364 a biased into engagement with the connector 351 by the plunger spring 365 to urge the head assembly 350 from a non-tilted or operative position to a pivoted or tilted position on the center rod 362. In a preferred position, the fingers 353 c formed on the backup plate 353 engage a top surface 362 b of the center rod 362 to prevent the head assembly 350 from pivoting about the pivot pin 366. When the anvil assembly 332 is attached to a surgical stapler 2 and the surgical stapler 2 is fired, the backup plate 353 and the cut ring assembly 354 are pushed into the inner annular recess 352 b of the housing 352 about the connector 351 by the annular knife 420 (FIG. 18) to move the fingers 353 c of the backup plate 353 out of engagement with the top surface 362 b of the center rod 362 and to permit the plunger 364 to pivot the head assembly 350 about the pivot pin 366. The spacer 358 prevents inadvertent or premature movement of the backup plate 353 and the cut ring assembly 354 to prevent premature or inadvertent tilting of the head assembly 350.

A retaining clip 368 is positioned in a transverse slot 351 a formed in the connector 351 and is operatively engaged with the pivot pin 366. After the backup plate 353 has been pushed into the inner annular recess 252 b of the housing 252 by the annular knife 420 of the surgical stapler 2, the retaining clip 368 is configured to prevent the backup plate 353 and the cut ring assembly 354 from sticking to the annular knife 420 when the anvil assembly 332 is moved away from the staple cartridge assembly 334.

A second end portion 362 c of the center rod 362 includes a bore 363 b defined by flexible arms 362 d. The flexible arms 362 d are configured and dimensioned to releasably secure a trocar (not shown) of the surgical stapler 2 to the center rod 362 of the anvil assembly 332. A plurality of splines 362 e are formed about the center rod 362 to align the anvil assembly 332 with the staple cartridge assembly 334 of the surgical stapler 2, and a recessed portion 362 f of the center rod 362 facilitates grasping of the anvil assembly 332 by a user (e.g., with a grasper).

With continued reference to FIGS. 14 and 15, a surgical buttress 370 is releasably coupled to the anvil assembly 332 of the surgical stapler 2 via an anvil cap 380. The surgical buttress 370 may be fabricated from biocompatible materials which are bioabsorbable or non-absorbable, natural or synthetic materials, or combinations thereof, and may be porous, non-porous, or combinations thereof, as described above with respect to the surgical buttress 100, 200.

The surgical buttress 370 includes a body or buttress portion 372 and a plurality of legs 374 extending radially outwardly from the body portion 372. The body portion 372 has a generally circular or annular configuration defining a central aperture 373 therethrough. The body portion 372 is sized and dimensioned to extend over (e.g., completely cover) the tissue facing surface 357 of the anvil assembly 332. The central aperture 373 is sized and dimensioned to allow passage of the center rod 362 of the anvil assembly 332 therethrough. In embodiments, the central aperture 373 has a diameter that is larger than the diameter of the center rod 362 of the anvil assembly 332 and, in some embodiments, the central aperture 373 has a diameter that is about the same as or smaller than the diameter of the center rod 362 such that the center rod 362 frictionally engages the surgical buttress 370. The legs 374 of the surgical buttress 370 extend from the body portion 372 radially beyond the tissue facing surface 357 of the anvil assembly 332 such that the legs 374 can be wrapped around the housing 352 of the anvil assembly 332. While the legs 374 are shown extending linearly and uniformly from the body portion 372, other configurations of the legs 374 are envisioned.

The surgical buttress 370 is disposed on the anvil assembly 332 of the surgical stapler 2 with the body portion 372 selectively supported on and positioned over the tissue facing surface 357 of the anvil plate 356 and the legs 374 selectively positioned around the housing 352 such that free ends 374 a of the legs 374 are adjacent an outer or distal surface 352 f of the housing 352. The legs 374 are releasably secured against the distal surface 352 f of the housing 352 by the anvil cap 380.

The anvil cap 380 includes a cap body 382 supported on the distal surface 352 f of the housing 352. The cap body 382 includes one or more pegs 384 extending proximally from an inner or proximal wall 382 a of the cap body 382. Each peg 384 has a split body including first and second legs 384 a, 384 b terminating at flanged ends 384 c. The first and second legs 384 a, 384 b are deflectable inwardly and outwardly relative to each other. The pegs 384 are positionable through the openings 352 a defined in the housing 352 to facilitate securement of the anvil cap 380 to the housing 352 and to permit the anvil cap 380 to move relative to the housing 352 between an approximated or closed position and an unapproximated or open position, as described in further detail below.

The anvil cap 380 is utilized to releasably attach the surgical buttress 370 to the anvil assembly 332. In the approximated position, as shown in FIG. 16, the pegs 384 of the anvil cap 380 are positioned through the openings 352 a of the housing 352 of the anvil assembly 332 such that the proximal wall 382 a of the anvil cap 380 abuts the distal surface 352 f of the housing 352, and engages and holds the legs 374 of the surgical buttress 370 therebetween. In embodiments, the legs 374 of the surgical buttress 370 are retained between a curved rim 382 b of the body 382 of the anvil cap 380 and the distal surface 352 f of the housing 352. The flanged ends 384 c of the pegs 384 of the anvil cap 380 are positioned adjacent to (e.g., against) the backup plate 353 of the anvil assembly 332. Upon firing of the surgical stapler 2, the cutting ring assembly 354 and the backup plate 353 are moved towards and into engagement with the pegs 384 to move the anvil cap 380 to the unapproximated position, as shown in FIG. 17. In the unapproximated position, the pegs 384 and thus, the anvil cap 380 are moved distally or axially away from the housing 352 to create a gap “G” between the housing 352 and the anvil cap 380 such that the legs 374 of the surgical buttress 370 can be released from the anvil assembly 332 and the surgical buttress 370 can separate from the anvil assembly 332. The flanged ends 384 c of the pegs 384 act as self-locking features to ensure that the anvil cap 380 remains attached to, and does not pop off the housing 352 when moved between the approximated and unapproximated positions.

In a method of assembling the surgical buttress 370 to the stapler 2, the body portion 372 of the surgical buttress 370 is position adjacent to the tissue facing surface 357 of the anvil plate 356 and the legs 374 are wrapped around the housing 352 of the anvil assembly 332 such that the free ends 374 a of the legs 370 of the surgical buttress 374 are positioned adjacent the distal surface 352 f of the housing 352. The anvil cap 380 is then attached to the housing 352 by aligning the pegs 384 with the openings 352 a defined in the housing 352 and axially pushing the anvil cap 380 towards the housing 352 and into the approximated position such that the legs 374 of the surgical buttress 370 are trapped between the anvil cap 380 and the housing 352. During movement of the anvil cap 380 towards the housing 352, the first and second legs 384 a, 384 b of each of the pegs 384 are deflected towards each other as the flanged ends 384 c are compressed into the opening 352 a of the housing 352 and then return to their biased position such that the flanged ends 384 c of the pegs 384 are slidably retained within the housing 352. The anvil assembly 332, with loaded surgical buttress 370, is ready for use with the surgical stapler 2 according to methods within the purview of those skilled in the art.

With reference now to FIG. 18, in conjunction with FIG. 14, the staple cartridge assembly 334 is disposed at the distal end portion 322 of the elongate tubular body 320 of the surgical stapler 2 and is configured to fire and form an annular array of surgical fasteners or staples, and to sever a ring of tissue. The staple cartridge assembly 334 includes a housing 390 having a staple guide 400, a plurality of staples 410, an annular knife 420, and a staple pusher 430 disposed therein. The staple guide 400 includes a tissue facing surface 402 defining at least one annular array of staple receiving slots 404 therein. The plurality of staples 410 are disposed, one each, in each of the staple receiving slots 404. The staple pusher 430 includes a proximal portion 430 a having a generally frusto-conical shape and a distal portion 430 b defining at least one concentric ring of peripherally spaced fingers 432, each of which is received within one of the respective staple receiving slots 404 of the staple guide 400. The annular knife 420 is mounted to the staple pusher 430 and is substantially in the form of an open cup with a rim thereof defining a knife edge 422. The annular knife 420 is disposed radially inward of the staples 410 and the staple receiving slots 404 of the staple guide 400 such that, in use, as the staple pusher 430 is advanced, the annular knife 420 is also advanced axially in a linear direction.

A surgical buttress assembly 440 is releasably coupled to the staple cartridge assembly 334 of the surgical stapler 2. The surgical buttress assembly 440 includes a surgical buttress 450 and an elongate member, tether or leash 460. The surgical buttress 450 may be fabricated from biocompatible materials which are bioabsorbable or non-absorbable, natural or synthetic materials, or combinations thereof, and may be porous, non-porous, or combinations thereof, as described above with respect to the surgical buttress 100, 200, 370.

As seen in FIGS. 14 and 19, the surgical buttress 450 is substantially the same as surgical buttress 370 and includes a body or buttress portion 452 and a plurality of legs 454 extending radially outwardly from the body 452. The body 452 has a generally circular or annular configuration defining a central aperture 453 therethrough. The body 452 is sized and dimensioned to extend over (e.g., completely cover) the tissue facing surface 402 of the staple cartridge assembly 334. The central aperture 453 is sized and dimensioned to allow passage of the center rod 362 of the anvil assembly 332 therethrough. The legs 454 of the surgical buttress 450 extend from the body 452 radially beyond the tissue facing surface 402 of the staple cartridge assembly 334. Together, the body 452 and the legs 454 are sized and shaped to be positioned over the staple cartridge assembly 334.

The elongate member 460 is secured to the legs 454 of the surgical buttress 450 and extends proximally therefrom. The elongate member 460 is of a sufficient length to be accessible outside of a patient's body and may extend the length of the elongate tubular body 320 of the surgical stapler 2 (e.g., at least to or beyond the handle assembly 310). As seen in FIG. 14, the elongate member 460 may be wrapped or loosely tied along the length of the elongate tubular body 320, or the elongate member 460 may extend freely along the length thereof. The elongate member 460 may be a band, a cord, a rope, a strap, a suture, among other elongate structures tethered to the legs 454 of the surgical buttress 450.

As shown in FIG. 19, the legs 454 of the surgical buttress 450 are disposed equidistantly around the body 452. Each of the legs 374 is configured to include at least one opening or cutout disposed in a portion of the leg 454 adjacent the body 452 that will be aligned with the elongate member 460 (FIG. 14). For example, a first leg 454 a includes a pair of openings 455 defined therein, a second leg 454 b disposed in opposed relation relative to the first leg 454 a defines an elongated opening or slot 456 therein, and third and fourth legs 454 c, 454 d each include a pair of opposed cutouts 457 (e.g., recesses or notches) defined therein.

With reference again to FIGS. 14 and 19, a central portion 460 a of the elongate member 460 is looped through the pair of openings 455 defined in the second leg 454 a, and first and second elongated portions 460 b, 460 c of the elongate member 460 are passed under the second and third legs 454 c, 454 d, respectively, such that the elongate member 460 is aligned with and positioned beneath the opposed cutouts 457 defined in the third and fourth legs 454 c, 454 d. The first and second elongated portions 460 b, 460 c are then passed through the elongated opening 456 of the second leg 454 b and guided proximally along the elongate tubular body 320 of the surgical stapler 2. In embodiments, a sleeve tube 480 is utilized to hold free ends 454 e of the legs 454 against the housing 390 of the staple cartridge assembly 334. Alternatively, the free ends 454 e of the legs 454 may be secured to the staple cartridge assembly 334 via any suitable attachment features within the purview of those skilled in the art, such as, mechanical attachment features (e.g., sutures, pins), chemical attachment features (e.g., adhesives), and/or attachment methods (e.g., welding).

When the elongate member 460 is pulled away from the elongate tubular body 320 (e.g., proximally towards a user), the elongate member 460 breaks (e.g., cuts or tears) through the legs 454 of the surgical buttress 450 as shown in FIG. 20. From an initial stage, the elongate member 460 first tears through the second leg 454 b of the surgical buttress 450, then through the third and fourth legs 454 c, 454 d, and finally through the first leg 454 a thus separating the legs 454 from the body 452 so that the body 452 is free and the legs 454 remain secured to the staple cartridge assembly 334. Other configurations of the legs 454 of the surgical buttress 450 are also envisioned that are suitable for separating the legs 454 from the body 452 of the surgical buttress 450 (e.g., weakened, perforated, and/or thinner regions of the legs) via the elongate member 460.

In a method of use, the loaded surgical stapler 2 is introduced to a surgical site. Specifically, the surgical stapler 2 and detachable anvil assembly 332 are used in an anastomosis procedure to effect joining of tissue sections (e.g., intestinal or other tubular organ sections). The surgical stapler 2 is operated within methods known by those skilled in the art. Once the anvil and staple cartridge assemblies 332, 334 are positioned in the tissue sections and the anvil assembly 332 has been connected to the elongated tubular body 320 of the surgical stapler 2, the anvil assembly 332 is approximated towards the elongated tubular body 320 (e.g., via the advancing member 314 of the handle assembly 310) to approximate the tissue sections and the surgical stapler 2 is fired (e.g., via movable handle members 312) to fire the staples 410 from the staple cartridge assembly 334 towards the housing 352 of the anvil assembly 332 to effect stapling of the tissue sections to one another, as well as the surgical buttresses 370, 450 to the tissue sections. During firing, the annular knife 420 cuts the stapled tissue sections, as well as any portion of the surgical buttresses 370, 450 extending radially inwardly of the annular knife 420 to complete the anastomosis.

During actuation of the surgical stapler 2, the cut ring assembly 334 is pushed axially such that the anvil cap 380 is moved distally away from the anvil assembly 332 from the approximated position to the unapproximated position, as described above, so that the legs 374 of the surgical buttress 370 associated with the anvil assembly 332 are free to release the now-stapled surgical buttress 370 therefrom. The surgical buttress 450 associated with the staple cartridge assembly 334 can then be detached from the now-stapled body 452 of the surgical buttress 450 by pulling the elongate member 460 proximally to separate the legs 454 from the body 452, as described above.

In any of the embodiments disclosed herein, the surgical buttress can include, or be used with, brachytherapy, chemotherapy, other medical materials or pharmaceuticals. The buttress portion or body of the surgical buttress can have pockets, apertures, or other features for retaining brachytherapy seeds with the buttress portion, or brachytherapy seeds or materials can be incorporated into a suture or sutures that are threaded into or through the buttress portion or otherwise attached thereto. A coating having brachytherapy materials can be applied to a buttress portion or body of a surgical buttress by spraying or dipping. Chemotherapy pharmaceuticals or agents can be incorporated into the buttress portion of the surgical buttress, coated thereon, or applied as part of a suture or suture or other feature.

It should be understood that the surgical buttresses, surgical buttress loading assemblies, and/or surgical buttress assemblies described herein may be used with other surgical apparatus, such as electromechanical surgical devices as described, for example, in U.S. Patent Appl. Pub. Nos. 2015/0157320 and 2015/0157321, and U.S. patent application Ser. No. 15/972,606, filed on May 7, 2018, the entire contents of each of which are incorporated herein by reference.

For example, as shown in FIG. 21, a surgical device 500 is in the form of a powered handheld electromechanical instrument. The surgical device 500 includes a handle assembly 510 configured for selective connection with an adapter assembly 520 and, in turn, the adapter assembly 200 is configured for selective connection with an end effector 530. Surgical buttresses 100, 100 a, 100 b and/or surgical buttress loading assembly 201 may be configured for use with the end effector 530 of the surgical device 500. As another example, as shown in FIG. 22, a surgical device 600, also in the form of a powered handheld electromechanical instrument, includes the handle assembly 510 configured for selective connection with an adapter assembly 620 and, in turn, the adapter assembly 620 is configured for selective connection with an end effector 630. Surgical buttress assemblies including the surgical buttress 370 and the anvil cap 380, and/or the surgical buttress 450 and the elongate member 460 may be configured for use with the end effector 630 of the surgical device 600.

While several embodiments of the disclosure have been shown in the drawings, it is not intended that the disclosure be limited thereto, as it is intended that the disclosure be as broad in scope as the art will allow and that the specification be read likewise. It is to be understood, therefore, that the present disclosure is not limited to the precise embodiments described, and that various other changes and modifications may be effected by one skilled in the art without departing from the scope or spirit of the disclosure. Additionally, the elements and features shown and described in connection with certain embodiments may be combined with the elements and features of certain other embodiments without departing from the scope of the present disclosure, and that such modifications and variation are also included within the scope of the present disclosure. Therefore, the above description should not be construed as limiting, but merely as exemplifications of preferred embodiments. Thus the scope of the embodiments should be determined by the appended claims and their legal equivalents, rather than by the examples given. 

What is claimed is:
 1. A surgical stapling system comprising: a surgical stapling apparatus including: a handle assembly; an elongate tubular body extending distally from the handle assembly; and an end effector extending distally from the elongate tubular body, the end effector including an anvil assembly and a staple cartridge assembly; and a staple cartridge surgical buttress assembly including: a surgical buttress including a body having an annular configuration and legs extending from the body, the body positioned against a tissue facing surface of the staple cartridge assembly and the legs positioned against a housing of the staple cartridge assembly, at least one of the legs including an opening defined therethrough and at least one of the legs including a cutout defined in a side edge thereof; and a leash extending around the housing and threaded through the opening defined in the at least one leg including the opening and under the cutout defined in the at least one leg including the cutout, the leash extending proximally from the surgical buttress towards the handle assembly.
 2. The surgical stapling system according to claim 1, wherein each of the legs of the surgical buttress includes the opening or the cutout.
 3. The surgical stapling system according to claim 1, wherein the legs of the surgical buttress alternate between including the opening and the cutout.
 4. The surgical stapling system according to claim 1, wherein a central portion of the leash is looped through a pair of openings defined in a first leg of the legs of the surgical buttress, and first and second elongated portions of the leash are passed around the housing of the staple cartridge assembly and through an opening defined in a second leg of the legs of the surgical buttress that is opposed to the first leg.
 5. The surgical stapling system according to claim 4, wherein third and fourth legs of the legs of the surgical buttress each include a pair of opposed cutouts defined therein, and the first and second elongated portions of the leash respectively extend under the pair of opposed cutouts.
 6. The surgical stapling system according to claim 1, wherein free ends of the legs of the surgical buttress are secured to the housing of the staple cartridge assembly.
 7. The surgical stapling system according to claim 1, further comprising a sleeve tube positioned around the housing of the staple cartridge assembly and over free ends of the legs of the surgical buttress to retain the legs against the staple cartridge assembly.
 8. The surgical stapling system according to claim 1, further comprising an anvil surgical buttress assembly including: a surgical buttress including a body having an annular configuration and legs extending from the body, the body positioned against a tissue facing surface of the anvil assembly and the legs positioned against a distal surface of a housing of the anvil assembly; and an anvil cap coupled to the housing of the anvil assembly, the anvil cap movable between an approximated position in which the legs of the surgical buttress are captured between the anvil cap and the housing of the anvil assembly and an unapproximated position in which the anvil cap is spaced from the housing and the legs of the surgical buttress are released.
 9. The surgical stapling system according to claim 8, wherein the anvil cap includes a cap body supported on the distal surface of the housing and pegs extending proximally from the cap body, the pegs positioned through openings defined in the housing.
 10. The surgical stapling system according to claim 9, wherein the pegs of the anvil cap have flanged ends.
 11. The surgical stapling system according to claim 10, wherein each of the pegs of the anvil cap has a split body including first and second legs terminating at the flanged ends, the first and second legs deflectable inwardly and outwardly relative to each other.
 12. The surgical stapling system according to claim 1, wherein the cutout defined in the at least one leg including the cutout is one of a pair of opposed cutouts defined in the side edges of the at least one leg.
 13. A staple cartridge assembly comprising: a housing; a staple guide supported within the housing, the staple guide including a tissue facing surface having staple receiving slots defined therein, each of the staple receiving slots housing a staple therein; a surgical buttress including a body having an annular configuration and legs extending from the body, the body positioned against the tissue facing surface of the staple guide and the legs positioned against the housing, at least one of the legs including an opening defined therethrough and at least one of the legs including a cutout defined in a side edge thereof; and a leash extending around the housing and threaded through the opening defined in the at least one leg including the opening and under the cutout defined in the at least one leg including the cutout, the leash extending proximally from the surgical buttress.
 14. The staple cartridge assembly according to claim 13, wherein each of the legs of the surgical buttress includes the opening or the cutout.
 15. The staple cartridge assembly according to claim 13, wherein the legs of the surgical buttress alternate between including the opening and the cutout.
 16. The staple cartridge assembly according to claim 13, wherein a central portion of the leash is looped through a pair of openings defined in a first leg of the legs of the surgical buttress, and first and second elongated portions of the leash are passed around the housing and through an opening defined in a second leg of the legs of the surgical buttress that is opposed to the first leg.
 17. The staple cartridge assembly according to claim 16, wherein third and fourth legs of the legs of the surgical buttress each include a pair of opposed cutouts defined therein, and the first and second elongated portions of the leash respectively extend under the pair of opposed cutouts.
 18. The staple cartridge assembly according to claim 13, wherein free ends of the legs of the surgical buttress are secured to the housing.
 19. The staple cartridge assembly according to claim 13, further comprising a sleeve tube positioned around the housing and over free ends of the legs of the surgical buttress to retain the legs against the housing. 